(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Physics

A piece of stone of mass 113 g sinks to the bottom in water contained in a measuring cylinder and water level in cylinder rises from 30 ml to 40 ml. Calculate R.D. of stone.

A body of volume 100 cm³ weighs 1 kgf in air. Find:

1. Its weight in water and
2. Its relative density.

A body of mass 70 kg, when completely immersed in water, displaces 20,000 cm³ of water. Find: (i) The weight of body in water and (ii) The relative density of material of the body. 

A stone of density 3000 kgm³ is lying submerged in water of density 1000 kgm³. If the mass of stone in air is 150 kg, calculate the force required to lift the stone. [g = 10 ms²]

A solid of area of cross-section 0.004 m² and length 0.60 m is completely immersed in water of density 1000 kgm³. Calculate:

1. Wt of solid in SI system
2. Upthrust acting on the solid in SI system.
3. Apparent weight of solid in water.
4. Apparent weight of solid in brine solution of density 1050 kgm³.
   [Take g = 10 N/kg; Density of solid = 7200 kgm³]

A solid of density 7600 kgm³ is found to weigh 0.950 kgf in air. If 4/5 volume of solid is completely immersed in a solution of density 900 kgm³, find the apparent weight of solid in a liquid.

A glass cylinder of length 12 x 10^-2 m and area of cross­section 5 x 10^-4 m² has a density of 2500 kgm^-3. It is immersed in a liquid of density 1500 kgm^-3, such that 3/8. of its length is above the liquid. Find the apparent weight of glass cylinder in newtons.

A solid weighs 0.08 kgf in air and 0.065 kgf in water. Find
(1) R.D. of solid
(2) Density of solid in SI system. [Density of water = 1000 kgm³]

A solid of R.D. = 2.5 is found to weigh 0.120 kgf in water. Find the wt. of solid in air.

State its value in C.G.S. as well as in S.I. system.

A solid of R.D. 4.2 is found to weigh 0.200 kgf in air. Find its apparent weight in water.

When is the acceleration due to gravity positive?

When is the acceleration due to gravity negative?

Give an example of an accelerated body, moving with a uniform speed.

An aluminium cube of side 5 cm and RD. 2.7 is suspended by a thread in alcohol of relative density 0.80. Find the tension in thread.

A cube of the lead of side 8 cm and R.D. 10.6 is suspended from the hook of a spring balance. Find the reading of spring balance. The cube is now completely immersed in sugar solution of R.D. 1.4. Calculate the new reading of spring balance.

The change in velocity of a motorbike is 54 kmh⁻¹ in one minute. Calculate its acceleration in (a) ms⁻² (b) kmh⁻².

A cylinder made of copper and aluminium floats in mercury of density 13.6 gem^-3, such that 0.26th part of it is below mercury. Find the density of solid.

An iceberg floats in sea water of density 1.17 g cm ³, such that 2/9 of its volume is above sea water. Find the density of iceberg.

Draw velocity – time graph for the following situation:

When a body is moving with variable velocity, but uniform retardation.